1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

BMW E91 318i - key fob problems

Discussion in 'Car Repairs / Maintenance' started by H0M3R_j4y, 25 May 2018.

  1. H0M3R_j4y

    Joined:
    14 May 2017
    Messages:
    36
    Thanks Received:
    0
    Country:
    United Kingdom
    I've had an issue with my key fob for my car for over a year now. I've just been too tight to get it sorted. I cannot remotely lock or unluck my car with any of the buttons on my key fob, or even my spare key fob for that matter. I am having to unluck the car the old fashioned way with the actual key which is hidden insde the key fob. This sets the alarm off everytime I get into the car. Once I put the key fob into the ignition, the alarm is disabled.

    When I first got the issue over a year ago a took it to Sytner BMW and I asked them for a new key. They said the chances are if both keys are not working then its more than likely the reciever unit or some harness in the car that is at fault. Putting up the maintenance bill to closer to a grand. I basically said stuff that I'll live with it for now.

    Now I'm getting sick of this problem, and although I've now got a bit of spare cash I'm still not paying over the odds Sytner prices. I took the car to an auto electrics garage local to me which I know have a fair reputation. He checked if the keys were sending out a signal by using a reciever box, and said, the keys are your problem, they are not sending out a signal. He recommended local car locksmith which can repair or replace keys.

    Went to the locksmith, told them the problem, and they check the keys with the reciever box, and it worked! My main key worked anyway, the spare key was dead, but according to his reciever box my car key was sending out a signal. He showed me it working and compared it with other keys to confirm.

    Back to the auto electrics garage, he tried the keys again on his unit and once again they did not work. He even showed me and did it with several other keys to show that his receiver box was working. He can't really diagnose any fault with the car as its the key that doesn't appear to be working. He then recommended I went to Sytner to ask them to do a quick check on the keys to see if they are sending a signal.

    You know what Sytner are like, nothing is quick, or cheap. I asked them to check the keys but I have to book in as they are full for at least another week. Its a full diagnosis which is £90, and the chances are they will come up with the most expensive option, which is replace the reciever unit/harness at the cost of a grand. If it was this I would rather get it done by a cheaper garage.

    Does anyone have any ideas what this could be? Or an easier way to find out if it is the keys, or the car? This should be a simple fix, but a difference of opinions is making it difficult.
     
  2. bobsuerita

    Joined:
    7 Feb 2017
    Messages:
    286
    Thanks Received:
    53
    Country:
    United Kingdom
    Take a look online you can reprogram the key too the car unless bm tryed that had same promblem on my m3
    Also if you have two keys keep alternating them or the batteries will go dead as charged by car
     
  3. H0M3R_j4y

    Joined:
    14 May 2017
    Messages:
    36
    Thanks Received:
    0
    Country:
    United Kingdom
    Been doing a lot of googling and it seems all the sites I'm finding are how to program a brand new blank key yourself, by holding the keyfob down in the ingnition slot for 20seconds. I will give it a try though with this one. The spare key is completely dead by the sound of it but I'm more concerned about getting the primary key working, or the car receiver working.
    Thats the problem, I dont know whether the issue lies with the car or the key.
     
  4. Belle427

    Joined:
    16 Jan 2006
    Messages:
    2,826
    Thanks Received:
    267
    Location:
    Newport, S Wales.
    Country:
    United Kingdom
    Try googling Diversity Antenna, I’ve read about problems with water ingress or damage due to its location in the tailgate.
     
  5. H0M3R_j4y

    Joined:
    14 May 2017
    Messages:
    36
    Thanks Received:
    0
    Country:
    United Kingdom
    I already checked the diversity antenna. Everything online pointed to that being the problem but when I checked mine it looked good as new, no signs of water damage or anything.

    I think its going to have to be a trip to different garage to see what they come up with. Thanks anyway for your help.
     
  6. Belle427

    Joined:
    16 Jan 2006
    Messages:
    2,826
    Thanks Received:
    267
    Location:
    Newport, S Wales.
    Country:
    United Kingdom
    Good luck with it, certainly sounds like it’s a trip to the stealers unfortunately.
    Are they the keys that recharge in the car when driven?
     
Loading...

Share This Page